Ace Didymium Glass Working Spectacles in Stylish Small Metal Safety Frame with Removable Side Shields - 49-18-140mm Eye Size by ACE Glass at Donations Central. MPN: GB-P2-TB-49. Hurry! Limited time offer. Offer valid only while supplies last. Glass Lenses for Contrast Enhancement - This new material, called Phillips 202, utilizes rare earth oxides in the glass composition to achieve the unique color enhancing characteristics. Basically, the color enhancement concept works by selectively positioning transmission in the blue, green, and red spectral regions whereby one can improve the color discrimination between different color objects. These are the same colors used to produce a color television picture. They optimize the
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